Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Andri Yngvason <andri.yngvason@marel.com>,
        Marc Kleine-Budde <mkl@pengutronix.de>
Subject: [PATCH 3.18 18/93] can: cc770: Fix use after free in cc770_tx_interrupt()
Date:   Fri,  6 Apr 2018 15:22:47 +0200
Message-Id: <20180406084225.782375530@linuxfoundation.org>
In-Reply-To: <20180406084224.918716300@linuxfoundation.org>
References: <20180406084224.918716300@linuxfoundation.org>
User-Agent: quilt/0.65
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andri Yngvason <andri.yngvason@marel.com>

commit 9ffd7503944ec7c0ef41c3245d1306c221aef2be upstream.

This fixes use after free introduced by the last cc770 patch.

Signed-off-by: Andri Yngvason <andri.yngvason@marel.com>
Fixes: 746201235b3f ("can: cc770: Fix queue stall & dropped RTR reply")
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/can/cc770/cc770.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/net/can/cc770/cc770.c
+++ b/drivers/net/can/cc770/cc770.c
@@ -705,13 +705,12 @@ static void cc770_tx_interrupt(struct ne
 		return;
 	}
 
-	can_put_echo_skb(priv->tx_skb, dev, 0);
-	can_get_echo_skb(dev, 0);
-
 	cf = (struct can_frame *)priv->tx_skb->data;
 	stats->tx_bytes += cf->can_dlc;
 	stats->tx_packets++;
 
+	can_put_echo_skb(priv->tx_skb, dev, 0);
+	can_get_echo_skb(dev, 0);
 	priv->tx_skb = NULL;
 
 	netif_wake_queue(dev);